package com.applet.interceptor;

import com.alibaba.fastjson.JSON;
import com.applet.common.constant.ResultConstant;
import com.applet.common.properties.JwtProperties;
import com.applet.common.constant.JwtClaimsConstant;
import com.applet.common.context.BaseContext;
import com.applet.common.properties.JwtProperties;
import com.applet.common.utils.JwtUtil;
import com.applet.common.vo.Result;
import com.applet.pojo.entity.User;
import io.jsonwebtoken.Claims;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;


/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 校验jwt
     *
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getTokenName());

        log.info("jwt校验:{}", token);
        Claims claims = null;

        //2、校验令牌
        try {
            claims = JwtUtil.parseJWT(jwtProperties.getSecretKey(), token);
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            log.info("jwt校验失败 => {}", token);

            response.setContentType("application/json;charset=utf-8");
            request.setCharacterEncoding("UTF-8");

            response.getWriter().write(JSON.toJSONString(Result.fail(
                    ResultConstant.FAIL_NOT_LOGGED_IN.getCode(),
                    ResultConstant.FAIL_NOT_LOGGED_IN.getMessage()
            )));
            return false;
        }
        //3、通过，放行
        String volunteerId = claims.get(JwtClaimsConstant.VOLUNTEER_ID).toString();
        Short perm = Short.valueOf(claims.get(JwtClaimsConstant.PERM).toString());
        BaseContext.setCurrentId(volunteerId);
        BaseContext.setCurrentPerm(perm);
        log.info("当前志愿者id：{}", volunteerId);
        return true;
    }
}
